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https://ondemand.npr.org/anon.npr-mp3/npr/atc/2021/12/20211215_atc_public_health_options_omicron.mp3?orgId=1&topicId=1128&d=243&p=2&story=1064614652&ft=nprml&f=1003,1004,1007,1013,1014,1015,1017,1024,1025,1026,1059,1122,1150
A new statewide mask mandate in California went into effect Wednesday, bringing the total number of states with mask mandates to 10. That has some public health advocates worried as omicron spreads.
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